NPDES Permits Potentially Affecting Water Quality
Final NPDES Wastewater Permits - Issued by Washington Department of Ecology
This list consists of permit documents* (see end) made available by Washington Ecology and is not all inclusive. All documents are PDF except where indicated.
Emerald Kalama Chemical Industrial Waste (IW) Discharge: Final NPDES Wastewater Permit Related Documents
Permitted Mixing Zone Size for Toxicity:
Waterbody: Columbia River at about River Mile (RM) 74.
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Acute Mixing Zone: 10 feet upstream to 32.5 feet downstream. MZ width up to 25% width of the Columbia River.
Acute Mixing Zone Surface Area: Not determinable since numerical width dimension not given.
Chronic Mixing Zone: 100 feet upstream to 325 feet downstream. MZ width up to 25% width of the Columbia River.
Chronic Mixing Zone Surface Area: Not determinable since numerical width dimension not given.
Chronic Mixing Zone Volume: Not determinable since numerical width dimension not given.
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